diff options
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/mach-octeon/cvmx-pcie.c | 2487 |
1 files changed, 2487 insertions, 0 deletions
diff --git a/arch/mips/mach-octeon/cvmx-pcie.c b/arch/mips/mach-octeon/cvmx-pcie.c new file mode 100644 index 0000000000..f42d44cbec --- /dev/null +++ b/arch/mips/mach-octeon/cvmx-pcie.c @@ -0,0 +1,2487 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Marvell International Ltd. + * + * Interface to PCIe as a host(RC) or target(EP) + */ + +#include <log.h> +#include <linux/delay.h> +#include <linux/libfdt.h> + +#include <mach/cvmx-regs.h> +#include <mach/octeon-model.h> +#include <mach/cvmx-fuse.h> +#include <mach/octeon-feature.h> +#include <mach/cvmx-qlm.h> +#include <mach/octeon_qlm.h> + +#include <mach/cvmx-helper-fdt.h> + +#include <mach/cvmx-regs.h> +#include <mach/octeon-model.h> +#include <mach/cvmx-fuse.h> +#include <mach/octeon-feature.h> +#include <mach/cvmx-qlm.h> +#include <mach/octeon_qlm.h> +#include <mach/cvmx-pcie.h> +#include <mach/cvmx-error.h> +#include <mach/cvmx-helper.h> +#include <mach/cvmx-helper-util.h> +#include <mach/cvmx-bgxx-defs.h> +#include <mach/cvmx-ciu-defs.h> +#include <mach/cvmx-gmxx-defs.h> +#include <mach/cvmx-gserx-defs.h> +#include <mach/cvmx-mio-defs.h> +#include <mach/cvmx-pciercx-defs.h> +#include <mach/cvmx-pcieepx-defs.h> +#include <mach/cvmx-pemx-defs.h> +#include <mach/cvmx-pexp-defs.h> +#include <mach/cvmx-rst-defs.h> +#include <mach/cvmx-sata-defs.h> +#include <mach/cvmx-sli-defs.h> +#include <mach/cvmx-sriomaintx-defs.h> +#include <mach/cvmx-sriox-defs.h> + +#include <mach/cvmx-dpi-defs.h> +#include <mach/cvmx-sli-defs.h> +#include <mach/cvmx-dtx-defs.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define MRRS_CN6XXX 3 /* 1024 byte Max Read Request Size */ +#define MPS_CN6XXX 0 /* 128 byte Max Packet Size (Limit of most PCs) */ + +/* Endian swap mode. */ +#define _CVMX_PCIE_ES 1 + +#define CVMX_READ_CSR(addr) csr_rd_node(node, addr) +#define CVMX_WRITE_CSR(addr, val) csr_wr_node(node, addr, val) +#define CVMX_PCIE_CFGX_READ(p, addr) cvmx_pcie_cfgx_read_node(node, p, addr) +#define CVMX_PCIE_CFGX_WRITE(p, addr, val) cvmx_pcie_cfgx_write_node(node, p, addr, val) + +/* #define DEBUG_PCIE */ + +/* Delay after link up, before issuing first configuration read */ +#define PCIE_DEVICE_READY_WAIT_DELAY_MICROSECONDS 700000 + +/* Recommended Preset Vector: Drop Preset 10 */ +int pcie_preset_vec[4] = { 0x593, 0x593, 0x593, 0x593 }; + +/* Number of LTSSM transitions to record, must be a power of 2 */ +#define LTSSM_HISTORY_SIZE 64 +#define MAX_RETRIES 2 + +bool pcie_link_initialized[CVMX_MAX_NODES][CVMX_PCIE_MAX_PORTS]; +int cvmx_primary_pcie_bus_number = 1; + +static uint32_t __cvmx_pcie_config_read32(int node, int pcie_port, int bus, int dev, int func, + int reg, int lst); + +/** + * Return the Core virtual base address for PCIe IO access. IOs are + * read/written as an offset from this address. + * + * @param pcie_port PCIe port the IO is for + * + * @return 64bit Octeon IO base address for read/write + */ +uint64_t cvmx_pcie_get_io_base_address(int pcie_port) +{ + cvmx_pcie_address_t pcie_addr; + + pcie_addr.u64 = 0; + pcie_addr.io.upper = 0; + pcie_addr.io.io = 1; + pcie_addr.io.did = 3; + pcie_addr.io.subdid = 2; + pcie_addr.io.node = (pcie_port >> 4) & 0x3; + pcie_addr.io.es = _CVMX_PCIE_ES; + pcie_addr.io.port = (pcie_port & 0x3); + return pcie_addr.u64; +} + +/** + * Size of the IO address region returned at address + * cvmx_pcie_get_io_base_address() + * + * @param pcie_port PCIe port the IO is for + * + * @return Size of the IO window + */ +uint64_t cvmx_pcie_get_io_size(int pcie_port) +{ + return 1ull << 32; +} + +/** + * Return the Core virtual base address for PCIe MEM access. Memory is + * read/written as an offset from this address. + * + * @param pcie_port PCIe port the IO is for + * + * @return 64bit Octeon IO base address for read/write + */ +uint64_t cvmx_pcie_get_mem_base_address(int pcie_port) +{ + cvmx_pcie_address_t pcie_addr; + + pcie_addr.u64 = 0; + pcie_addr.mem.upper = 0; + pcie_addr.mem.io = 1; + pcie_addr.mem.did = 3; + pcie_addr.mem.subdid = 3 + (pcie_port & 0x3); + pcie_addr.mem.node = (pcie_port >> 4) & 0x3; + return pcie_addr.u64; +} + +/** + * Size of the Mem address region returned at address + * cvmx_pcie_get_mem_base_address() + * + * @param pcie_port PCIe port the IO is for + * + * @return Size of the Mem window + */ +uint64_t cvmx_pcie_get_mem_size(int pcie_port) +{ + return 1ull << 36; +} + +/** + * @INTERNAL + * Return the QLM number for the PCIE port. + * + * @param pcie_port QLM number to return for. + * + * @return QLM number. + */ +static int __cvmx_pcie_get_qlm(int node, int pcie_port) +{ + if (OCTEON_IS_MODEL(OCTEON_CN73XX)) { + cvmx_pemx_cfg_t pem_cfg; + cvmx_pemx_qlm_t pem_qlm; + cvmx_gserx_cfg_t gserx_cfg; + + switch (pcie_port) { + case 0: /* PEM0 */ + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(0)); + if (gserx_cfg.s.pcie) + return 0; /* PEM0 is on QLM0 and possibly QLM1 */ + else + return -1; /* PEM0 is disabled */ + case 1: /* PEM1 */ + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(0)); + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(1)); + if (!pem_cfg.cn78xx.lanes8 && gserx_cfg.s.pcie) + return 1; /* PEM1 is on QLM 1 */ + else + return -1; /* PEM1 is disabled */ + case 2: /* PEM2 */ + pem_qlm.u64 = CVMX_READ_CSR(CVMX_PEMX_QLM(2)); + if (pem_qlm.cn73xx.pemdlmsel == 1) { + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(5)); + if (gserx_cfg.s.pcie) + return 5; /* PEM2 is on DLM5 */ + else + return -1; /* PEM2 is disabled */ + } + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(2)); + if (gserx_cfg.s.pcie) + return 2; /* PEM2 is on QLM2 and possibly QLM3 */ + else + return -1; /* PEM2 is disabled */ + case 3: /* PEM3 */ + pem_qlm.u64 = CVMX_READ_CSR(CVMX_PEMX_QLM(3)); + if (pem_qlm.cn73xx.pemdlmsel == 1) { + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(6)); + if (gserx_cfg.s.pcie) + return 6; /* PEM2 is on DLM5 */ + else + return -1; /* PEM2 is disabled */ + } + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(2)); + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(3)); + if (!pem_cfg.cn78xx.lanes8 && gserx_cfg.s.pcie) + return 3; /* PEM2 is on QLM2 and possibly QLM3 */ + else + return -1; /* PEM2 is disabled */ + default: + printf("Invalid %d PCIe port\n", pcie_port); + return -2; + } + } else if (OCTEON_IS_MODEL(OCTEON_CN78XX)) { + cvmx_pemx_cfg_t pem_cfg; + cvmx_gserx_cfg_t gserx_cfg; + + switch (pcie_port) { + case 0: + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(0)); + if (gserx_cfg.s.pcie) + return 0; /* PEM0 is on QLM0 and possibly QLM1 */ + else + return -1; /* PEM0 is disabled */ + case 1: /* PEM1 */ + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(0)); + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(1)); + if (!pem_cfg.cn78xx.lanes8 && gserx_cfg.s.pcie) + return 1; /* PEM1 is on QLM 1 */ + else + return -1; /* PEM1 is disabled */ + case 2: /* PEM2 */ + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(2)); + if (gserx_cfg.s.pcie) + return 2; /* PEM2 is on QLM2 and possibly QLM3 */ + else + return -1; /* PEM2 is disabled */ + case 3: /* PEM3 */ + { + cvmx_gserx_cfg_t gser4_cfg; + + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(2)); + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(3)); + gser4_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(4)); + if (pem_cfg.cn78xx.lanes8) { + if (gser4_cfg.s.pcie) + return 4; /* PEM3 is on QLM4 */ + else + return -1; /* PEM3 is disabled */ + } else { + if (gserx_cfg.s.pcie) + return 3; /* PEM3 is on QLM3 */ + else if (gser4_cfg.s.pcie) + return 4; /* PEM3 is on QLM4 */ + else + return -1; /* PEM3 is disabled */ + } + } + default: + printf("Invalid %d PCIe port\n", pcie_port); + return -1; + } + } else if (OCTEON_IS_MODEL(OCTEON_CN70XX)) { + enum cvmx_qlm_mode mode1 = cvmx_qlm_get_mode(1); + enum cvmx_qlm_mode mode2 = cvmx_qlm_get_mode(2); + + switch (pcie_port) { + case 0: /* PCIe0 can be DLM1 with 1, 2 or 4 lanes */ + if (mode1 == CVMX_QLM_MODE_PCIE || /* Using DLM 1-2 */ + mode1 == CVMX_QLM_MODE_PCIE_1X2 || /* Using DLM 1 */ + mode1 == CVMX_QLM_MODE_PCIE_2X1 || /* Using DLM 1, lane 0 */ + mode1 == CVMX_QLM_MODE_PCIE_1X1) /* Using DLM 1, l0, l1 not used */ + return 1; + else + return -1; + case 1: /* PCIe1 can be DLM1 1 lane(1), DLM2 1 lane(0) or 2 lanes(0-1) */ + if (mode1 == CVMX_QLM_MODE_PCIE_2X1) + return 1; + else if (mode2 == CVMX_QLM_MODE_PCIE_1X2) + return 2; + else if (mode2 == CVMX_QLM_MODE_PCIE_2X1) + return 2; + else + return -1; + case 2: /* PCIe2 can be DLM2 1 lanes(1) */ + if (mode2 == CVMX_QLM_MODE_PCIE_2X1) + return 2; + else + return -1; + default: /* Only three PEM blocks */ + return -1; + } + } else if (OCTEON_IS_MODEL(OCTEON_CNF75XX)) { + cvmx_gserx_cfg_t gserx_cfg; + + switch (pcie_port) { + case 0: /* PEM0 */ + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(0)); + if (gserx_cfg.s.pcie) + return 0; /* PEM0 is on QLM0 and possibly QLM1 */ + else + return -1; /* PEM0 is disabled */ + case 1: /* PEM1 */ + gserx_cfg.u64 = CVMX_READ_CSR(CVMX_GSERX_CFG(1)); + if (gserx_cfg.s.pcie) + return 1; /* PEM1 is on DLM1 */ + else + return -1; /* PEM1 is disabled */ + default: + return -1; + } + } + return -1; +} + +/** + * @INTERNAL + * Initialize the RC config space CSRs + * + * @param node node + * @param pcie_port PCIe port to initialize + */ +static void __cvmx_pcie_rc_initialize_config_space(int node, int pcie_port) +{ + /* Max Payload Size (PCIE*_CFG030[MPS]) */ + /* Max Read Request Size (PCIE*_CFG030[MRRS]) */ + /* Relaxed-order, no-snoop enables (PCIE*_CFG030[RO_EN,NS_EN] */ + /* Error Message Enables (PCIE*_CFG030[CE_EN,NFE_EN,FE_EN,UR_EN]) */ + { + cvmx_pciercx_cfg030_t pciercx_cfg030; + + pciercx_cfg030.u32 = CVMX_PCIE_CFGX_READ(pcie_port, + CVMX_PCIERCX_CFG030(pcie_port)); + pciercx_cfg030.s.mps = MPS_CN6XXX; + pciercx_cfg030.s.mrrs = MRRS_CN6XXX; + /* + * Enable relaxed order processing. This will allow devices + * to affect read response ordering + */ + pciercx_cfg030.s.ro_en = 1; + /* Enable no snoop processing. Not used by Octeon */ + pciercx_cfg030.s.ns_en = 1; + /* Correctable error reporting enable. */ + pciercx_cfg030.s.ce_en = 1; + /* Non-fatal error reporting enable. */ + pciercx_cfg030.s.nfe_en = 1; + /* Fatal error reporting enable. */ + pciercx_cfg030.s.fe_en = 1; + /* Unsupported request reporting enable. */ + pciercx_cfg030.s.ur_en = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG030(pcie_port), + pciercx_cfg030.u32); + } + + /* + * Max Payload Size (DPI_SLI_PRTX_CFG[MPS]) must match + * PCIE*_CFG030[MPS] + */ + /* + * Max Read Request Size (DPI_SLI_PRTX_CFG[MRRS]) must not exceed + * PCIE*_CFG030[MRRS] + */ + cvmx_dpi_sli_prtx_cfg_t prt_cfg; + cvmx_sli_s2m_portx_ctl_t sli_s2m_portx_ctl; + + prt_cfg.u64 = CVMX_READ_CSR(CVMX_DPI_SLI_PRTX_CFG(pcie_port)); + prt_cfg.s.mps = MPS_CN6XXX; + prt_cfg.s.mrrs = MRRS_CN6XXX; + /* Max outstanding load request. */ + prt_cfg.s.molr = 32; + CVMX_WRITE_CSR(CVMX_DPI_SLI_PRTX_CFG(pcie_port), prt_cfg.u64); + + sli_s2m_portx_ctl.u64 = CVMX_READ_CSR(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port)); + if (!(OCTEON_IS_MODEL(OCTEON_CN78XX) || OCTEON_IS_MODEL(OCTEON_CN73XX) || + OCTEON_IS_MODEL(OCTEON_CNF75XX))) + sli_s2m_portx_ctl.cn61xx.mrrs = MRRS_CN6XXX; + CVMX_WRITE_CSR(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port), sli_s2m_portx_ctl.u64); + + /* ECRC Generation (PCIE*_CFG070[GE,CE]) */ + { + cvmx_pciercx_cfg070_t pciercx_cfg070; + + pciercx_cfg070.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG070(pcie_port)); + pciercx_cfg070.s.ge = 1; /* ECRC generation enable. */ + pciercx_cfg070.s.ce = 1; /* ECRC check enable. */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG070(pcie_port), pciercx_cfg070.u32); + } + + /* Access Enables (PCIE*_CFG001[MSAE,ME]) */ + /* ME and MSAE should always be set. */ + /* Interrupt Disable (PCIE*_CFG001[I_DIS]) */ + /* System Error Message Enable (PCIE*_CFG001[SEE]) */ + { + cvmx_pciercx_cfg001_t pciercx_cfg001; + + pciercx_cfg001.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG001(pcie_port)); + pciercx_cfg001.s.msae = 1; /* Memory space enable. */ + pciercx_cfg001.s.me = 1; /* Bus master enable. */ + pciercx_cfg001.s.i_dis = 1; /* INTx assertion disable. */ + pciercx_cfg001.s.see = 1; /* SERR# enable */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG001(pcie_port), pciercx_cfg001.u32); + } + + /* Advanced Error Recovery Message Enables */ + /* (PCIE*_CFG066,PCIE*_CFG067,PCIE*_CFG069) */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG066(pcie_port), 0); + /* Use CVMX_PCIERCX_CFG067 hardware default */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG069(pcie_port), 0); + + /* Active State Power Management (PCIE*_CFG032[ASLPC]) */ + { + cvmx_pciercx_cfg032_t pciercx_cfg032; + + pciercx_cfg032.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG032(pcie_port)); + pciercx_cfg032.s.aslpc = 0; /* Active state Link PM control. */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG032(pcie_port), pciercx_cfg032.u32); + } + + /* Link Width Mode (PCIERCn_CFG452[LME]) - Set during + * cvmx_pcie_rc_initialize_link() + */ + /* Primary Bus Number (PCIERCn_CFG006[PBNUM]) */ + { + /* We set the primary bus number to 1 so IDT bridges are happy. + * They don't like zero + */ + cvmx_pciercx_cfg006_t pciercx_cfg006; + + pciercx_cfg006.u32 = 0; + pciercx_cfg006.s.pbnum = cvmx_primary_pcie_bus_number; + pciercx_cfg006.s.sbnum = cvmx_primary_pcie_bus_number; + pciercx_cfg006.s.subbnum = cvmx_primary_pcie_bus_number; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG006(pcie_port), pciercx_cfg006.u32); + } + + /* Memory-mapped I/O BAR (PCIERCn_CFG008) */ + /* Most applications should disable the memory-mapped I/O BAR by */ + /* setting PCIERCn_CFG008[ML_ADDR] < PCIERCn_CFG008[MB_ADDR] */ + { + cvmx_pciercx_cfg008_t pciercx_cfg008; + + pciercx_cfg008.u32 = 0; + pciercx_cfg008.s.mb_addr = 0x100; + pciercx_cfg008.s.ml_addr = 0; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG008(pcie_port), pciercx_cfg008.u32); + } + + /* Prefetchable BAR (PCIERCn_CFG009,PCIERCn_CFG010,PCIERCn_CFG011) */ + /* Most applications should disable the prefetchable BAR by setting */ + /* PCIERCn_CFG011[UMEM_LIMIT],PCIERCn_CFG009[LMEM_LIMIT] < */ + /* PCIERCn_CFG010[UMEM_BASE],PCIERCn_CFG009[LMEM_BASE] */ + { + cvmx_pciercx_cfg009_t pciercx_cfg009; + cvmx_pciercx_cfg010_t pciercx_cfg010; + cvmx_pciercx_cfg011_t pciercx_cfg011; + + pciercx_cfg009.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG009(pcie_port)); + pciercx_cfg010.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG010(pcie_port)); + pciercx_cfg011.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG011(pcie_port)); + pciercx_cfg009.s.lmem_base = 0x100; + pciercx_cfg009.s.lmem_limit = 0; + pciercx_cfg010.s.umem_base = 0x100; + pciercx_cfg011.s.umem_limit = 0; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG009(pcie_port), pciercx_cfg009.u32); + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG010(pcie_port), pciercx_cfg010.u32); + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG011(pcie_port), pciercx_cfg011.u32); + } + + /* System Error Interrupt Enables (PCIERCn_CFG035[SECEE,SEFEE,SENFEE]) */ + /* PME Interrupt Enables (PCIERCn_CFG035[PMEIE]) */ + { + cvmx_pciercx_cfg035_t pciercx_cfg035; + + pciercx_cfg035.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG035(pcie_port)); + pciercx_cfg035.s.secee = 1; /* System error on correctable error enable. */ + pciercx_cfg035.s.sefee = 1; /* System error on fatal error enable. */ + pciercx_cfg035.s.senfee = 1; /* System error on non-fatal error enable. */ + pciercx_cfg035.s.pmeie = 1; /* PME interrupt enable. */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG035(pcie_port), pciercx_cfg035.u32); + } + + /* Advanced Error Recovery Interrupt Enables */ + /* (PCIERCn_CFG075[CERE,NFERE,FERE]) */ + { + cvmx_pciercx_cfg075_t pciercx_cfg075; + + pciercx_cfg075.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG075(pcie_port)); + pciercx_cfg075.s.cere = 1; /* Correctable error reporting enable. */ + pciercx_cfg075.s.nfere = 1; /* Non-fatal error reporting enable. */ + pciercx_cfg075.s.fere = 1; /* Fatal error reporting enable. */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG075(pcie_port), pciercx_cfg075.u32); + } + + /* HP Interrupt Enables (PCIERCn_CFG034[HPINT_EN], */ + /* PCIERCn_CFG034[DLLS_EN,CCINT_EN]) */ + { + cvmx_pciercx_cfg034_t pciercx_cfg034; + + pciercx_cfg034.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG034(pcie_port)); + pciercx_cfg034.s.hpint_en = 1; /* Hot-plug interrupt enable. */ + pciercx_cfg034.s.dlls_en = 1; /* Data Link Layer state changed enable */ + pciercx_cfg034.s.ccint_en = 1; /* Command completed interrupt enable. */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG034(pcie_port), pciercx_cfg034.u32); + } + + if (OCTEON_IS_MODEL(OCTEON_CN78XX) || OCTEON_IS_MODEL(OCTEON_CN73XX) || + OCTEON_IS_MODEL(OCTEON_CNF75XX)) { + int qlm = __cvmx_pcie_get_qlm(node, pcie_port); + int speed = cvmx_qlm_get_gbaud_mhz(qlm); + cvmx_pemx_cfg_t pem_cfg; + cvmx_pciercx_cfg031_t cfg031; + cvmx_pciercx_cfg040_t cfg040; + cvmx_pciercx_cfg452_t cfg452; + cvmx_pciercx_cfg089_t cfg089; + cvmx_pciercx_cfg090_t cfg090; + cvmx_pciercx_cfg091_t cfg091; + cvmx_pciercx_cfg092_t cfg092; + cvmx_pciercx_cfg554_t cfg554; + + /* + * Make sure the PEM agrees with GSERX about the speed + * its going to try + */ + switch (speed) { + case 2500: /* Gen1 */ + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(pcie_port)); + pem_cfg.s.md = 0; + CVMX_WRITE_CSR(CVMX_PEMX_CFG(pcie_port), pem_cfg.u64); + + /* Set the target link speed */ + cfg040.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG040(pcie_port)); + cfg040.s.tls = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG040(pcie_port), cfg040.u32); + break; + case 5000: /* Gen2 */ + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(pcie_port)); + pem_cfg.s.md = 1; + CVMX_WRITE_CSR(CVMX_PEMX_CFG(pcie_port), pem_cfg.u64); + + /* Set the target link speed */ + cfg040.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG040(pcie_port)); + cfg040.s.tls = 2; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG040(pcie_port), cfg040.u32); + break; + case 8000: /* Gen3 */ + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(pcie_port)); + pem_cfg.s.md = 2; + CVMX_WRITE_CSR(CVMX_PEMX_CFG(pcie_port), pem_cfg.u64); + + /* Set the target link speed */ + cfg040.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG040(pcie_port)); + cfg040.s.tls = 3; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG040(pcie_port), cfg040.u32); + break; + default: + break; + } + + /* Link Width Mode (PCIERCn_CFG452[LME]) */ + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(pcie_port)); + cfg452.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG452(pcie_port)); + if (qlm >= 5) + cfg452.s.lme = 0x3; + else + cfg452.s.lme = (pem_cfg.cn78xx.lanes8) ? 0xf : 0x7; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG452(pcie_port), cfg452.u32); + + /* Errata PEM-25990 - Disable ASLPMS */ + cfg031.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG031(pcie_port)); + cfg031.s.aslpms = 0; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG031(pcie_port), cfg031.u32); + + /* CFG554.PRV default changed from 16'h7ff to 16'h593. */ + cfg554.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG554(pcie_port)); + cfg554.s.prv = pcie_preset_vec[pcie_port]; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG554(pcie_port), cfg554.u32); + /* Errata PEM-26189 - Disable the 2ms timer on all chips */ + cfg554.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG554(pcie_port)); + cfg554.s.p23td = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG554(pcie_port), cfg554.u32); + + /* Errata PEM-21178 - Change the CFG[089-092] LxUTP & LxDTP defaults. */ + cfg089.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG089(pcie_port)); + cfg089.s.l1ddtp = 7; + cfg089.s.l1utp = 7; + cfg089.s.l0dtp = 7; + cfg089.s.l0utp = 7; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG089(pcie_port), cfg089.u32); + cfg090.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG090(pcie_port)); + cfg090.s.l3dtp = 7; + cfg090.s.l3utp = 7; + cfg090.s.l2dtp = 7; + cfg090.s.l2utp = 7; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG090(pcie_port), cfg090.u32); + cfg091.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG091(pcie_port)); + cfg091.s.l5dtp = 7; + cfg091.s.l5utp = 7; + cfg091.s.l4dtp = 7; + cfg091.s.l4utp = 7; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG091(pcie_port), cfg091.u32); + cfg092.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG092(pcie_port)); + cfg092.s.l7dtp = 7; + cfg092.s.l7utp = 7; + cfg092.s.l6dtp = 7; + cfg092.s.l6utp = 7; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG092(pcie_port), cfg092.u32); + } +} + +static void __cvmx_increment_ba(cvmx_sli_mem_access_subidx_t *pmas) +{ + if (OCTEON_IS_MODEL(OCTEON_CN68XX)) + pmas->cn68xx.ba++; + else + pmas->cn63xx.ba++; +} + +/* + * milliseconds to retry PCIe cfg-space access: + * Value 32(unscaled) was recommended in HRM, but may be too small for + * some PCIe devices. This 200mS default should cover most devices, + * but can be extended by bootparam cvmx-pcie.cfg_timeout, or reduced + * to speed boot if it is known that no devices need so much time. + */ +static int cfg_timeout = 200; + +static int cfg_retries(void) +{ + static int cfg_ticks = -1; + + if (cfg_ticks < 0) { + u64 nS = cfg_timeout * 1000000; + const int ceiling = 0xffff; + + cfg_ticks = nS / (gd->bus_clk >> 16); + if (cfg_ticks > ceiling) + cfg_ticks = ceiling; + } + + return cfg_ticks; +} + +/** + * @INTERNAL + * Enable/Disable PEMX_PEMON.pemon based on the direction. + * + * @param node node + * @param pcie_port PCIe port + * @param direction 0 to disable, 1 to enable + */ +static void __cvmx_pcie_config_pemon(int node, int pcie_port, bool direction) +{ + cvmx_pemx_on_t pemon; + + pemon.u64 = CVMX_READ_CSR(CVMX_PEMX_ON(pcie_port)); + pemon.s.pemon = direction; + CVMX_WRITE_CSR(CVMX_PEMX_ON(pcie_port), pemon.u64); + pemon.u64 = CVMX_READ_CSR(CVMX_PEMX_ON(pcie_port)); +} + +/** + * @INTERNAL + * De-assert GSER_PHY.phy_reset for a given qlm + * + * @param node node + * @param qlm qlm for a given PCIe port + */ +static void __cvmx_pcie_gser_phy_config(int node, int pcie_port, int qlm) +{ + cvmx_pemx_cfg_t pem_cfg; + cvmx_gserx_phy_ctl_t ctrl; + int has_8lanes = 0; + int is_gen3 = 0; + + ctrl.u64 = CVMX_READ_CSR(CVMX_GSERX_PHY_CTL(qlm)); + + /* Assert the reset */ + ctrl.s.phy_reset = 1; + CVMX_WRITE_CSR(CVMX_GSERX_PHY_CTL(qlm), ctrl.u64); + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(pcie_port)); + udelay(10); + + has_8lanes = pem_cfg.cn78xx.lanes8; + is_gen3 = pem_cfg.cn78xx.md >= 2; + + if (has_8lanes) { + ctrl.u64 = CVMX_READ_CSR(CVMX_GSERX_PHY_CTL(qlm + 1)); + ctrl.s.phy_reset = 1; + CVMX_WRITE_CSR(CVMX_GSERX_PHY_CTL(qlm + 1), ctrl.u64); + ctrl.u64 = CVMX_READ_CSR(CVMX_GSERX_PHY_CTL(qlm + 1)); + } + ctrl.u64 = CVMX_READ_CSR(CVMX_GSERX_PHY_CTL(qlm)); + udelay(10); + + /* Deassert the reset */ + ctrl.s.phy_reset = 0; + CVMX_WRITE_CSR(CVMX_GSERX_PHY_CTL(qlm), ctrl.u64); + pem_cfg.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG(pcie_port)); + udelay(500); + + if (has_8lanes) { + ctrl.u64 = CVMX_READ_CSR(CVMX_GSERX_PHY_CTL(qlm + 1)); + ctrl.s.phy_reset = 0; + CVMX_WRITE_CSR(CVMX_GSERX_PHY_CTL(qlm + 1), ctrl.u64); + } + ctrl.u64 = CVMX_READ_CSR(CVMX_GSERX_PHY_CTL(qlm)); + udelay(500); + + /* Apply some erratas after PHY reset, only applies to PCIe GEN3 */ + if (is_gen3) { + int i; + int high_qlm = has_8lanes ? qlm + 1 : qlm; + + /* Apply workaround for Errata GSER-26150 */ + if (OCTEON_IS_MODEL(OCTEON_CN73XX_PASS1_0)) { + for (i = qlm; i < high_qlm; i++) { + cvmx_gserx_glbl_pll_cfg_3_t pll_cfg_3; + cvmx_gserx_glbl_misc_config_1_t misc_config_1; + /* Update PLL parameters */ + /* + * Step 1: Set + * GSER()_GLBL_PLL_CFG_3[PLL_VCTRL_SEL_LCVCO_VAL] = 0x2, + * and + * GSER()_GLBL_PLL_CFG_3[PCS_SDS_PLL_VCO_AMP] = 0 + */ + pll_cfg_3.u64 = CVMX_READ_CSR(CVMX_GSERX_GLBL_PLL_CFG_3(i)); + pll_cfg_3.s.pcs_sds_pll_vco_amp = 0; + pll_cfg_3.s.pll_vctrl_sel_lcvco_val = 2; + CVMX_WRITE_CSR(CVMX_GSERX_GLBL_PLL_CFG_3(i), pll_cfg_3.u64); + + /* + * Step 2: Set + * GSER()_GLBL_MISC_CONFIG_1[PCS_SDS_TRIM_CHP_REG] = 0x2. + */ + misc_config_1.u64 = CVMX_READ_CSR(CVMX_GSERX_GLBL_MISC_CONFIG_1(i)); + misc_config_1.s.pcs_sds_trim_chp_reg = 2; + CVMX_WRITE_CSR(CVMX_GSERX_GLBL_MISC_CONFIG_1(i), misc_config_1.u64); + } + } + + /* Apply workaround for Errata GSER-25992 */ + if (OCTEON_IS_MODEL(OCTEON_CN73XX_PASS1_X) || + OCTEON_IS_MODEL(OCTEON_CN78XX_PASS1_X)) { + for (i = qlm; i < high_qlm; i++) + cvmx_qlm_gser_errata_25992(node, i); + } + } +} + +/* Get the PCIe LTSSM state for the given port + * + * @param node Node to query + * @param pcie_port PEM to query + * + * @return LTSSM state + */ +static int __cvmx_pcie_rc_get_ltssm_state(int node, int pcie_port) +{ + u64 debug; + + if (OCTEON_IS_MODEL(OCTEON_CN73XX) && pcie_port == 0) { + CVMX_WRITE_CSR(CVMX_DTX_SPEM_SELX(0), 0); + CVMX_READ_CSR(CVMX_DTX_SPEM_SELX(0)); + CVMX_WRITE_CSR(CVMX_DTX_SPEM_ENAX(0), 0xfffffffffull); + CVMX_READ_CSR(CVMX_DTX_SPEM_ENAX(0)); + + /* Read the value */ + debug = CVMX_READ_CSR(CVMX_DTX_SPEM_DATX(0)); + + /* Disable the PEM from driving OCLA signals */ + CVMX_WRITE_CSR(CVMX_DTX_SPEM_ENAX(0), 0); + CVMX_READ_CSR(CVMX_DTX_SPEM_ENAX(0)); + } else { + /* LTSSM state is in debug select 0 */ + CVMX_WRITE_CSR(CVMX_DTX_PEMX_SELX(0, pcie_port), 0); + CVMX_READ_CSR(CVMX_DTX_PEMX_SELX(0, pcie_port)); + CVMX_WRITE_CSR(CVMX_DTX_PEMX_ENAX(0, pcie_port), 0xfffffffffull); + CVMX_READ_CSR(CVMX_DTX_PEMX_ENAX(0, pcie_port)); + + /* Read the value */ + debug = CVMX_READ_CSR(CVMX_DTX_PEMX_DATX(0, pcie_port)); + + /* Disable the PEM from driving OCLA signals */ + CVMX_WRITE_CSR(CVMX_DTX_PEMX_ENAX(0, pcie_port), 0); + CVMX_READ_CSR(CVMX_DTX_PEMX_ENAX(0, pcie_port)); + } + + /* DBGSEL = 0x0, bits[8:3] */ + return cvmx_bit_extract(debug, 3, 6); +} + +/** + * Get the PCIe LTSSM state for the given port + * + * @param node Node to query + * @param pcie_port PEM to query + * + * @return LTSSM state + */ +static const char *cvmx_pcie_get_ltssm_string(int ltssm) +{ + switch (ltssm) { + case 0x00: + return "DETECT_QUIET"; + case 0x01: + return "DETECT_ACT"; + case 0x02: + return "POLL_ACTIVE"; + case 0x03: + return "POLL_COMPLIANCE"; + case 0x04: + return "POLL_CONFIG"; + case 0x05: + return "PRE_DETECT_QUIET"; + case 0x06: + return "DETECT_WAIT"; + case 0x07: + return "CFG_LINKWD_START"; + case 0x08: + return "CFG_LINKWD_ACEPT"; + case 0x09: + return "CFG_LANENUM_WAIT"; + case 0x0A: + return "CFG_LANENUM_ACEPT"; + case 0x0B: + return "CFG_COMPLETE"; + case 0x0C: + return "CFG_IDLE"; + case 0x0D: + return "RCVRY_LOCK"; + case 0x0E: + return "RCVRY_SPEED"; + case 0x0F: + return "RCVRY_RCVRCFG"; + case 0x10: + return "RCVRY_IDLE"; + case 0x11: + return "L0"; + case 0x12: + return "L0S"; + case 0x13: + return "L123_SEND_EIDLE"; + case 0x14: + return "L1_IDLE"; + case 0x15: + return "L2_IDLE"; + case 0x16: + return "L2_WAKE"; + case 0x17: + return "DISABLED_ENTRY"; + case 0x18: + return "DISABLED_IDLE"; + case 0x19: + return "DISABLED"; + case 0x1A: + return "LPBK_ENTRY"; + case 0x1B: + return "LPBK_ACTIVE"; + case 0x1C: + return "LPBK_EXIT"; + case 0x1D: + return "LPBK_EXIT_TIMEOUT"; + case 0x1E: + return "HOT_RESET_ENTRY"; + case 0x1F: + return "HOT_RESET"; + case 0x20: + return "RCVRY_EQ0"; + case 0x21: + return "RCVRY_EQ1"; + case 0x22: + return "RCVRY_EQ2"; + case 0x23: + return "RCVRY_EQ3"; + default: + return "Unknown"; + } +} + +/** + * During PCIe link initialization we need to make config request to the attached + * device to verify its speed and width. These config access happen very early + * after the device is taken out of reset, so may fail for some amount of time. + * This function automatically retries these config accesses. The normal builtin + * hardware retry isn't enough for this very early access. + * + * @param node Note to read from + * @param pcie_port PCIe port to read from + * @param bus PCIe bus number + * @param dev PCIe device + * @param func PCIe function on the device + * @param reg Register to read + * + * @return Config register value, or all ones on failure + */ +static uint32_t cvmx_pcie_config_read32_retry(int node, int pcie_port, int bus, int dev, int func, + int reg) +{ + /* + * Read the PCI config register until we get a valid value. Some cards + * require time after link up to return data. Wait at most 3 seconds + */ + u64 timeout = 300; + u32 val; + + do { + /* Read PCI capability pointer */ + val = __cvmx_pcie_config_read32(node, pcie_port, bus, dev, func, reg, 0); + + /* Check the read succeeded */ + if (val != 0xffffffff) + return val; + /* Failed, wait a little and try again */ + mdelay(10); + } while (--timeout); + + debug("N%d.PCIe%d: Config read failed, can't communicate with device\n", + node, pcie_port); + + return -1; +} + +/** + * @INTERNAL + * Initialize a host mode PCIe gen 2 link. This function takes a PCIe + * port from reset to a link up state. Software can then begin + * configuring the rest of the link. + * + * @param node node + * @param pcie_port PCIe port to initialize + * + * @return Zero on success + */ +static int __cvmx_pcie_rc_initialize_link_gen2(int node, int pcie_port) +{ + u64 start_cycle; + + cvmx_pemx_ctl_status_t pem_ctl_status; + cvmx_pciercx_cfg032_t pciercx_cfg032; + cvmx_pciercx_cfg448_t pciercx_cfg448; + + if (OCTEON_IS_OCTEON3()) { + if (CVMX_WAIT_FOR_FIELD64_NODE(node, CVMX_PEMX_ON(pcie_port), cvmx_pemx_on_t, + pemoor, ==, 1, 100000)) { + printf("%d:PCIe: Port %d PEM not on, skipping\n", node, pcie_port); + return -1; + } + } + + /* Bring up the link */ + pem_ctl_status.u64 = CVMX_READ_CSR(CVMX_PEMX_CTL_STATUS(pcie_port)); + pem_ctl_status.s.lnk_enb = 1; + CVMX_WRITE_CSR(CVMX_PEMX_CTL_STATUS(pcie_port), pem_ctl_status.u64); + + /* Wait for the link to come up */ + start_cycle = get_timer(0); + do { + if (get_timer(start_cycle) > 1000) + return -1; + + udelay(1000); + pciercx_cfg032.u32 = CVMX_PCIE_CFGX_READ(pcie_port, + CVMX_PCIERCX_CFG032(pcie_port)); + } while ((pciercx_cfg032.s.dlla == 0) || (pciercx_cfg032.s.lt == 1)); + + /* Update the Replay Time Limit. Empirically, some PCIe devices take a + * little longer to respond than expected under load. As a workaround + * for this we configure the Replay Time Limit to the value expected + * for a 512 byte MPS instead of our actual 256 byte MPS. The numbers + * below are directly from the PCIe spec table 3-4 + */ + pciercx_cfg448.u32 = CVMX_PCIE_CFGX_READ(pcie_port, + CVMX_PCIERCX_CFG448(pcie_port)); + switch (pciercx_cfg032.s.nlw) { + case 1: /* 1 lane */ + pciercx_cfg448.s.rtl = 1677; + break; + case 2: /* 2 lanes */ + pciercx_cfg448.s.rtl = 867; + break; + case 4: /* 4 lanes */ + pciercx_cfg448.s.rtl = 462; + break; + case 8: /* 8 lanes */ + pciercx_cfg448.s.rtl = 258; + break; + } + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG448(pcie_port), + pciercx_cfg448.u32); + + return 0; +} + +extern int octeon_pcie_get_qlm_from_fdt(int numa_node, int pcie_port); + +static int __cvmx_pcie_check_pcie_port(int node, int pcie_port, enum cvmx_qlm_mode mode) +{ + if (mode == CVMX_QLM_MODE_SRIO_1X4 || mode == CVMX_QLM_MODE_SRIO_2X2 || + mode == CVMX_QLM_MODE_SRIO_4X1) { + printf("%d:PCIe: Port %d is SRIO, skipping.\n", node, pcie_port); + return -1; + } else if (mode == CVMX_QLM_MODE_SGMII) { + printf("%d:PCIe: Port %d is SGMII, skipping.\n", node, pcie_port); + return -1; + } else if (mode == CVMX_QLM_MODE_XAUI || mode == CVMX_QLM_MODE_RXAUI) { + printf("%d:PCIe: Port %d is XAUI, skipping.\n", node, pcie_port); + return -1; + } else if (mode == CVMX_QLM_MODE_ILK) { + printf("%d:PCIe: Port %d is ILK, skipping.\n", node, pcie_port); + return -1; + } else if (mode != CVMX_QLM_MODE_PCIE && + mode != CVMX_QLM_MODE_PCIE_1X8 && + mode != CVMX_QLM_MODE_PCIE_1X2 && + mode != CVMX_QLM_MODE_PCIE_2X1 && + mode != CVMX_QLM_MODE_PCIE_1X1) { + printf("%d:PCIe: Port %d is unknown, skipping.\n", + node, pcie_port); + return -1; + } + return 0; +} + +static int __cvmx_pcie_check_qlm_mode(int node, int pcie_port, int qlm) +{ + enum cvmx_qlm_mode mode = CVMX_QLM_MODE_DISABLED; + + if (qlm < 0) + return -1; + + /* Make sure this interface is PCIe */ + if (OCTEON_IS_MODEL(OCTEON_CN70XX)) { + if (cvmx_qlm_get_dlm_mode(1, pcie_port) == + CVMX_QLM_MODE_DISABLED) { + printf("PCIe: Port %d not in PCIe mode, skipping\n", + pcie_port); + return -1; + } + } else if (octeon_has_feature(OCTEON_FEATURE_PCIE)) { + /* + * Requires reading the MIO_QLMX_CFG register to figure + * out the port type. + */ + if (OCTEON_IS_MODEL(OCTEON_CN68XX)) { + qlm = 3 - (pcie_port * 2); + } else if (OCTEON_IS_MODEL(OCTEON_CN61XX)) { + cvmx_mio_qlmx_cfg_t qlm_cfg; + + qlm_cfg.u64 = csr_rd(CVMX_MIO_QLMX_CFG(1)); + if (qlm_cfg.s.qlm_cfg == 1) + qlm = 1; + else + qlm = pcie_port; + } else if (OCTEON_IS_MODEL(OCTEON_CN66XX) || + OCTEON_IS_MODEL(OCTEON_CN63XX)) { + qlm = pcie_port; + } + + /* + * PCIe is allowed only in QLM1, 1 PCIe port in x2 or + * 2 PCIe ports in x1 + */ + else if (OCTEON_IS_MODEL(OCTEON_CNF71XX)) + qlm = 1; + + mode = cvmx_qlm_get_mode(qlm); + + __cvmx_pcie_check_pcie_port(node, pcie_port, mode); + } + return 0; +} + +static void __cvmx_pcie_sli_config(int node, int pcie_port) +{ + cvmx_pemx_bar_ctl_t pemx_bar_ctl; + cvmx_pemx_ctl_status_t pemx_ctl_status; + cvmx_sli_ctl_portx_t sli_ctl_portx; + cvmx_sli_mem_access_ctl_t sli_mem_access_ctl; + cvmx_sli_mem_access_subidx_t mem_access_subid; + cvmx_pemx_bar1_indexx_t bar1_index; + int i; + + /* Store merge control (SLI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */ + sli_mem_access_ctl.u64 = CVMX_READ_CSR(CVMX_PEXP_SLI_MEM_ACCESS_CTL); + sli_mem_access_ctl.s.max_word = 0; /* Allow 16 words to combine */ + sli_mem_access_ctl.s.timer = 127; /* Wait up to 127 cycles for more data */ + CVMX_WRITE_CSR(CVMX_PEXP_SLI_MEM_ACCESS_CTL, sli_mem_access_ctl.u64); + + /* Setup Mem access SubDIDs */ + mem_access_subid.u64 = 0; + mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */ + mem_access_subid.s.nmerge = 0; /* Allow merging as it works on CN6XXX. */ + mem_access_subid.s.esr = _CVMX_PCIE_ES; /* Endian-swap for Reads. */ + mem_access_subid.s.esw = _CVMX_PCIE_ES; /* Endian-swap for Writes. */ + mem_access_subid.s.wtype = 0; /* "No snoop" and "Relaxed ordering" are not set */ + mem_access_subid.s.rtype = 0; /* "No snoop" and "Relaxed ordering" are not set */ + /* PCIe Address Bits <63:34>. */ + if (OCTEON_IS_MODEL(OCTEON_CN68XX)) + mem_access_subid.cn68xx.ba = 0; + else + mem_access_subid.cn63xx.ba = 0; + + /* Setup mem access 12-15 for port 0, 16-19 for port 1, supplying 36 + * bits of address space + */ + for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) { + CVMX_WRITE_CSR(CVMX_PEXP_SLI_MEM_ACCESS_SUBIDX(i), mem_access_subid.u64); + /* Set each SUBID to extend the addressable range */ + __cvmx_increment_ba(&mem_access_subid); + } + + if (OCTEON_IS_MODEL(OCTEON_CN63XX) || OCTEON_IS_MODEL(OCTEON_CN66XX) || + OCTEON_IS_MODEL(OCTEON_CN68XX) || + (OCTEON_IS_OCTEON3() && !OCTEON_IS_MODEL(OCTEON_CN70XX))) { + /* Disable the peer to peer forwarding register. This must be + * setup by the OS after it enumerates the bus and assigns + * addresses to the PCIe busses + */ + for (i = 0; i < 4; i++) { + CVMX_WRITE_CSR(CVMX_PEMX_P2P_BARX_START(i, pcie_port), -1); + CVMX_WRITE_CSR(CVMX_PEMX_P2P_BARX_END(i, pcie_port), -1); + } + } + + /* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */ + CVMX_WRITE_CSR(CVMX_PEMX_P2N_BAR0_START(pcie_port), 0); + + /* Set Octeon's BAR2 to decode 0-2^41. Bar0 and Bar1 take precedence + * where they overlap. It also overlaps with the device addresses, so + * make sure the peer to peer forwarding is set right + */ + CVMX_WRITE_CSR(CVMX_PEMX_P2N_BAR2_START(pcie_port), 0); + + /* Setup BAR2 attributes */ + /* Relaxed Ordering (NPEI_CTL_PORTn[PTLP_RO,CTLP_RO, WAIT_COM]) */ + /* - PTLP_RO,CTLP_RO should normally be set (except for debug). */ + /* - WAIT_COM=0 will likely work for all applications. */ + /* Load completion relaxed ordering (NPEI_CTL_PORTn[WAITL_COM]) */ + pemx_bar_ctl.u64 = CVMX_READ_CSR(CVMX_PEMX_BAR_CTL(pcie_port)); + pemx_bar_ctl.s.bar1_siz = 3; /* 256MB BAR1 */ + pemx_bar_ctl.s.bar2_enb = 1; + pemx_bar_ctl.s.bar2_esx = _CVMX_PCIE_ES; + pemx_bar_ctl.s.bar2_cax = 0; + CVMX_WRITE_CSR(CVMX_PEMX_BAR_CTL(pcie_port), pemx_bar_ctl.u64); + sli_ctl_portx.u64 = CVMX_READ_CSR(CVMX_PEXP_SLI_CTL_PORTX(pcie_port)); + sli_ctl_portx.s.ptlp_ro = 1; + sli_ctl_portx.s.ctlp_ro = 1; + sli_ctl_portx.s.wait_com = 0; + sli_ctl_portx.s.waitl_com = 0; + CVMX_WRITE_CSR(CVMX_PEXP_SLI_CTL_PORTX(pcie_port), sli_ctl_portx.u64); + + /* BAR1 follows BAR2 */ + CVMX_WRITE_CSR(CVMX_PEMX_P2N_BAR1_START(pcie_port), + CVMX_PCIE_BAR1_RC_BASE); + + bar1_index.u64 = 0; + bar1_index.s.addr_idx = (CVMX_PCIE_BAR1_PHYS_BASE >> 22); + bar1_index.s.ca = 1; /* Not Cached */ + bar1_index.s.end_swp = _CVMX_PCIE_ES; /* Endian Swap mode */ + bar1_index.s.addr_v = 1; /* Valid entry */ + + for (i = 0; i < 16; i++) { + CVMX_WRITE_CSR(CVMX_PEMX_BAR1_INDEXX(i, pcie_port), + bar1_index.u64); + /* 256MB / 16 >> 22 == 4 */ + bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22); + } + + /* Wait for 200ms */ + pemx_ctl_status.u64 = CVMX_READ_CSR(CVMX_PEMX_CTL_STATUS(pcie_port)); + pemx_ctl_status.cn63xx.cfg_rtry = cfg_retries(); + CVMX_WRITE_CSR(CVMX_PEMX_CTL_STATUS(pcie_port), pemx_ctl_status.u64); + + /* + * Here is the second part of the config retry changes. Wait for 700ms + * after setting up the link before continuing. PCIe says the devices + * may need up to 900ms to come up. 700ms plus 200ms from above gives + * us a total of 900ms + */ + if (OCTEON_IS_OCTEON2() || OCTEON_IS_MODEL(OCTEON_CN70XX)) + udelay(PCIE_DEVICE_READY_WAIT_DELAY_MICROSECONDS); +} + +/** + * Initialize a PCIe gen 2 port for use in host(RC) mode. It doesn't enumerate + * the bus. + * + * @param pcie_port PCIe port to initialize + * + * @return Zero on success + */ +static int __cvmx_pcie_rc_initialize_gen2(int pcie_port) +{ + cvmx_ciu_soft_prst_t ciu_soft_prst; + cvmx_mio_rst_ctlx_t mio_rst_ctl; + cvmx_pemx_bist_status_t pemx_bist_status; + cvmx_pemx_bist_status2_t pemx_bist_status2; + cvmx_pciercx_cfg032_t pciercx_cfg032; + cvmx_pciercx_cfg515_t pciercx_cfg515; + u64 ciu_soft_prst_reg, rst_ctl_reg; + int ep_mode; + int qlm = 0; + int node = (pcie_port >> 4) & 0x3; + + pcie_port &= 0x3; + + if (pcie_port >= CVMX_PCIE_PORTS) { + //debug("Invalid PCIe%d port\n", pcie_port); + return -1; + } + + if (__cvmx_pcie_check_qlm_mode(node, pcie_port, qlm)) + return -1; + + /* Make sure we aren't trying to setup a target mode interface in host + * mode + */ + if (OCTEON_IS_OCTEON3()) { + ciu_soft_prst_reg = CVMX_RST_SOFT_PRSTX(pcie_port); + rst_ctl_reg = CVMX_RST_CTLX(pcie_port); + } else { + ciu_soft_prst_reg = (pcie_port) ? CVMX_CIU_SOFT_PRST1 : CVMX_CIU_SOFT_PRST; + rst_ctl_reg = CVMX_MIO_RST_CTLX(pcie_port); + } + mio_rst_ctl.u64 = CVMX_READ_CSR(rst_ctl_reg); + + ep_mode = ((OCTEON_IS_MODEL(OCTEON_CN61XX) || OCTEON_IS_MODEL(OCTEON_CNF71XX)) ? + (mio_rst_ctl.s.prtmode != 1) : + (!mio_rst_ctl.s.host_mode)); + + if (OCTEON_IS_MODEL(OCTEON_CN70XX) && pcie_port) { + cvmx_pemx_cfg_t pemx_cfg; + + pemx_cfg.u64 = csr_rd(CVMX_PEMX_CFG(0)); + if ((pemx_cfg.s.md & 3) == 2) { + printf("PCIe: Port %d in 1x4 mode.\n", pcie_port); + return -1; + } + } + + if (ep_mode) { + printf("%d:PCIe: Port %d in endpoint mode.\n", node, pcie_port); + return -1; + } + + /* CN63XX Pass 1.0 errata G-14395 requires the QLM De-emphasis be + * programmed + */ + if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_0)) { + if (pcie_port) { + cvmx_ciu_qlm1_t ciu_qlm; + + ciu_qlm.u64 = csr_rd(CVMX_CIU_QLM1); + ciu_qlm.s.txbypass = 1; + ciu_qlm.s.txdeemph = 5; + ciu_qlm.s.txmargin = 0x17; + csr_wr(CVMX_CIU_QLM1, ciu_qlm.u64); + } else { + cvmx_ciu_qlm0_t ciu_qlm; + + ciu_qlm.u64 = csr_rd(CVMX_CIU_QLM0); + ciu_qlm.s.txbypass = 1; + ciu_qlm.s.txdeemph = 5; + ciu_qlm.s.txmargin = 0x17; + csr_wr(CVMX_CIU_QLM0, ciu_qlm.u64); + } + } + + /* Bring the PCIe out of reset */ + ciu_soft_prst.u64 = CVMX_READ_CSR(ciu_soft_prst_reg); + /* After a chip reset the PCIe will also be in reset. If it + * isn't, most likely someone is trying to init it again + * without a proper PCIe reset. + */ + if (ciu_soft_prst.s.soft_prst == 0) { + /* Reset the port */ + ciu_soft_prst.s.soft_prst = 1; + CVMX_WRITE_CSR(ciu_soft_prst_reg, ciu_soft_prst.u64); + + /* Read to make sure write happens */ + ciu_soft_prst.u64 = CVMX_READ_CSR(ciu_soft_prst_reg); + + /* Keep PERST asserted for 2 ms */ + udelay(2000); + } + + /* Deassert PERST */ + ciu_soft_prst.u64 = CVMX_READ_CSR(ciu_soft_prst_reg); + ciu_soft_prst.s.soft_prst = 0; + CVMX_WRITE_CSR(ciu_soft_prst_reg, ciu_soft_prst.u64); + ciu_soft_prst.u64 = CVMX_READ_CSR(ciu_soft_prst_reg); + + /* Wait 1ms for PCIe reset to complete */ + udelay(1000); + + /* Set MPLL multiplier as per Errata 20669. */ + if (OCTEON_IS_MODEL(OCTEON_CN70XX)) { + int qlm = __cvmx_pcie_get_qlm(0, pcie_port); + enum cvmx_qlm_mode mode; + int old_mult; + u64 meas_refclock = cvmx_qlm_measure_clock(qlm); + + if (meas_refclock > 99000000 && meas_refclock < 101000000) { + old_mult = 35; + } else if (meas_refclock > 124000000 && + meas_refclock < 126000000) { + old_mult = 56; + } else if (meas_refclock > 156000000 && + meas_refclock < 156500000) { + old_mult = 45; + } else { + printf("%s: Invalid reference clock for qlm %d\n", + __func__, qlm); + return -1; + } + mode = cvmx_qlm_get_mode(qlm); + __cvmx_qlm_set_mult(qlm, 2500, old_mult); + /* Adjust mplls for both dlms when configured as pcie 1x4 */ + if (mode == CVMX_QLM_MODE_PCIE && pcie_port == 0) + __cvmx_qlm_set_mult(qlm + 1, 2500, old_mult); + } + + /* + * Check and make sure PCIe came out of reset. If it doesn't the board + * probably hasn't wired the clocks up and the interface should be + * skipped + */ + if (CVMX_WAIT_FOR_FIELD64_NODE(node, rst_ctl_reg, cvmx_mio_rst_ctlx_t, + rst_done, ==, 1, 10000)) { + printf("%d:PCIe: Port %d stuck in reset, skipping.\n", node, pcie_port); + return -1; + } + + /* Check BIST status */ + pemx_bist_status.u64 = CVMX_READ_CSR(CVMX_PEMX_BIST_STATUS(pcie_port)); + if (pemx_bist_status.u64) + printf("%d:PCIe: BIST FAILED for port %d (0x%016llx)\n", node, pcie_port, + CAST64(pemx_bist_status.u64)); + pemx_bist_status2.u64 = CVMX_READ_CSR(CVMX_PEMX_BIST_STATUS2(pcie_port)); + + /* + * Errata PCIE-14766 may cause the lower 6 bits to be randomly set on + * CN63XXp1 + */ + if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X)) + pemx_bist_status2.u64 &= ~0x3full; + + if (pemx_bist_status2.u64) { + printf("%d:PCIe: BIST2 FAILED for port %d (0x%016llx)\n", + node, pcie_port, CAST64(pemx_bist_status2.u64)); + } + + /* Initialize the config space CSRs */ + __cvmx_pcie_rc_initialize_config_space(node, pcie_port); + + /* Enable gen2 speed selection */ + pciercx_cfg515.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG515(pcie_port)); + pciercx_cfg515.s.dsc = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG515(pcie_port), pciercx_cfg515.u32); + + /* Bring the link up */ + if (__cvmx_pcie_rc_initialize_link_gen2(node, pcie_port)) { + /* Some gen1 devices don't handle the gen 2 training correctly. + * Disable gen2 and try again with only gen1 + */ + cvmx_pciercx_cfg031_t pciercx_cfg031; + + pciercx_cfg031.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG031(pcie_port)); + pciercx_cfg031.s.mls = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG031(pcie_port), pciercx_cfg031.u32); + if (__cvmx_pcie_rc_initialize_link_gen2(node, pcie_port)) { + printf("PCIe: Link timeout on port %d, probably the slot is empty\n", + pcie_port); + return -1; + } + } + + __cvmx_pcie_sli_config(node, pcie_port); + + /* Display the link status */ + pciercx_cfg032.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG032(pcie_port)); + printf("PCIe: Port %d link active, %d lanes, speed gen%d\n", pcie_port, + pciercx_cfg032.s.nlw, pciercx_cfg032.s.ls); + + pcie_link_initialized[node][pcie_port] = true; + return 0; +} + +/** + * @INTERNAL + * Initialize a host mode PCIe gen 2 link. This function takes a PCIe + * port from reset to a link up state. Software can then begin + * configuring the rest of the link. + * + * @param node node + * @param pcie_port PCIe port to initialize + * + * @return Zero on success + */ +static int __cvmx_pcie_rc_initialize_link_gen2_v3(int node, int pcie_port) +{ + u8 ltssm_history[LTSSM_HISTORY_SIZE]; + int ltssm_history_loc; + cvmx_pemx_ctl_status_t pem_ctl_status; + cvmx_pciercx_cfg006_t pciercx_cfg006; + cvmx_pciercx_cfg031_t pciercx_cfg031; + cvmx_pciercx_cfg032_t pciercx_cfg032; + cvmx_pciercx_cfg068_t pciercx_cfg068; + cvmx_pciercx_cfg448_t pciercx_cfg448; + cvmx_pciercx_cfg515_t pciercx_cfg515; + int max_gen, max_width; + u64 hold_time; + u64 bounce_allow_time; + u64 timeout, good_time, current_time; + int neg_gen, neg_width, bus, dev_gen, dev_width; + unsigned int cap, cap_next; + int ltssm_state, desired_gen; + int desired_width; + int i, need_speed_change, need_lane_change; + int do_retry_speed = 0; + int link_up = 0, is_loop_done = 0; + + if (CVMX_WAIT_FOR_FIELD64_NODE(node, CVMX_PEMX_ON(pcie_port), cvmx_pemx_on_t, pemoor, ==, 1, + 100000)) { + printf("N%d:PCIe: Port %d PEM not on, skipping\n", node, pcie_port); + return -1; + } + + /* Record starting LTSSM state for debug */ + memset(ltssm_history, -1, sizeof(ltssm_history)); + ltssm_history[0] = __cvmx_pcie_rc_get_ltssm_state(node, pcie_port); + ltssm_history_loc = 0; + + pciercx_cfg031.u32 = CVMX_PCIE_CFGX_READ(pcie_port, + CVMX_PCIERCX_CFG031(pcie_port)); + /* Max speed of PEM from config (1-3) */ + max_gen = pciercx_cfg031.s.mls; + /* Max lane width of PEM (1-3) */ + max_width = pciercx_cfg031.s.mlw; +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link supports up to %d lanes, speed gen%d\n", + node, pcie_port, max_width, max_gen); +#endif + + /* Bring up the link */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Enabling the link\n", node, pcie_port); +#endif + pem_ctl_status.u64 = CVMX_READ_CSR(CVMX_PEMX_CTL_STATUS(pcie_port)); + pem_ctl_status.s.lnk_enb = 1; + CVMX_WRITE_CSR(CVMX_PEMX_CTL_STATUS(pcie_port), pem_ctl_status.u64); + + /* + * Configure SLI after enabling PCIe link. Is required for reading + * PCIe card capabilities. + */ + __cvmx_pcie_sli_config(node, pcie_port); + + /* + * After the link is enabled no prints until link up or error, + * Otherwise will miss link state captures + */ + +retry_speed: + /* Clear RC Correctable Error Status Register */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG068(pcie_port), -1); + + /* Wait for the link to come up and link training to be complete */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Waiting for link\n", node, pcie_port); +#endif + + /* Timeout of 2 secs */ + timeout = get_timer(0) + 2000; + + /* Records when the link first went good */ + good_time = 0; + + do { + pciercx_cfg032.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG032(pcie_port)); + /* + * Errata PEM-31375 PEM RSL access to PCLK registers can + * timeout during speed change. Check for temporary hardware + * timeout, and rety if happens + */ + if (pciercx_cfg032.u32 == 0xffffffff) + continue; + + /* Record LTSSM state for debug */ + ltssm_state = __cvmx_pcie_rc_get_ltssm_state(node, pcie_port); + + if (ltssm_history[ltssm_history_loc] != ltssm_state) { + ltssm_history_loc = (ltssm_history_loc + 1) & (LTSSM_HISTORY_SIZE - 1); + ltssm_history[ltssm_history_loc] = ltssm_state; + } + + /* Check if the link is up */ + // current_time = cvmx_get_cycle(); + current_time = get_timer(0); + link_up = (pciercx_cfg032.s.dlla && !pciercx_cfg032.s.lt); + + if (link_up) { + /* Is this the first link up? */ + if (!good_time) { + /* Mark the time when the link transitioned to good */ + good_time = current_time; + } else { + /* Check for a link error */ + pciercx_cfg068.u32 = CVMX_PCIE_CFGX_READ( + pcie_port, CVMX_PCIERCX_CFG068(pcie_port)); + if (pciercx_cfg068.s.res) { + /* + * Ignore errors before we've been + * stable for bounce_allow_time + */ + if (good_time + bounce_allow_time <= + current_time) { +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link errors after link up\n", + node, pcie_port); +#endif + /* Link error, signal a retry */ + return 1; + } + + /* + * Clear RC Correctable Error + * Status Register + */ + CVMX_PCIE_CFGX_WRITE(pcie_port, + CVMX_PCIERCX_CFG068(pcie_port), + -1); +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Ignored error during settling time\n", + node, pcie_port); +#endif + } + } + } else if (good_time) { + if (good_time + bounce_allow_time <= current_time) { + /* + * We allow bounces for bounce_allow_time after + * the link is good. Once this time passes any + * bounce requires a retry + */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link bounce detected\n", + node, pcie_port); +#endif + return 1; /* Link bounce, signal a retry */ + } + +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Ignored bounce during settling time\n", + node, pcie_port); +#endif + } + + /* Determine if we've hit the timeout */ + is_loop_done = (current_time >= timeout); + + /* + * Determine if we've had a good link for the required hold + * time + */ + is_loop_done |= link_up && (good_time + hold_time <= + current_time); + } while (!is_loop_done); + + /* Trace the LTSSM state */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: LTSSM History\n", node, pcie_port); +#endif + for (i = 0; i < LTSSM_HISTORY_SIZE; i++) { + ltssm_history_loc = (ltssm_history_loc + 1) & (LTSSM_HISTORY_SIZE - 1); +#ifdef DEBUG_PCIE + if (ltssm_history[ltssm_history_loc] != 0xff) + printf("N%d.PCIe%d: %s\n", node, pcie_port, + cvmx_pcie_get_ltssm_string(ltssm_history[ltssm_history_loc])); +#endif + } + + if (!link_up) { + ltssm_state = __cvmx_pcie_rc_get_ltssm_state(node, pcie_port); +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link down, Data link layer %s(DLLA=%d), Link training %s(LT=%d), LTSSM %s\n", + node, pcie_port, pciercx_cfg032.s.dlla ? "active" : "down", + pciercx_cfg032.s.dlla, pciercx_cfg032.s.lt ? "active" : "complete", + pciercx_cfg032.s.lt, cvmx_pcie_get_ltssm_string(ltssm_state)); +#endif + return 1; /* Link down, signal a retry */ + } + + /* Report the negotiated link speed and width */ + neg_gen = pciercx_cfg032.s.ls; /* Current speed of PEM (1-3) */ + neg_width = pciercx_cfg032.s.nlw; /* Current lane width of PEM (1-8) */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link negotiated %d lanes, speed gen%d\n", node, pcie_port, neg_width, + neg_gen); +#endif + /* Determine PCIe bus number the directly attached device uses */ + pciercx_cfg006.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG006(pcie_port)); + bus = pciercx_cfg006.s.sbnum; + + /* The SLI has to be initialized so we can read the downstream devices */ + dev_gen = 1; /* Device max speed (1-3) */ + dev_width = 1; /* Device max lane width (1-16) */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Reading Bus %d device max speed and width\n", node, pcie_port, bus); +#endif + + /* + * Here is the second part of the config retry changes. Wait for 700ms + * after setting up the link before continuing. PCIe says the devices + * may need up to 900ms to come up. 700ms plus 200ms from above gives + * us a total of 900ms + */ + udelay(PCIE_DEVICE_READY_WAIT_DELAY_MICROSECONDS); + + /* Read PCI capability pointer at offset 0x34 of target */ + cap = cvmx_pcie_config_read32_retry(node, pcie_port, bus, 0, 0, 0x34); + + /* Check if we were able to read capabilities pointer */ + if (cap == 0xffffffff) + return 1; /* Signal retry needed */ + + /* Read device max speed and width */ + cap_next = cap & 0xff; + while (cap_next) { + cap = cvmx_pcie_config_read32_retry(node, pcie_port, bus, + 0, 0, cap_next); + if (cap == 0xffffffff) + return 1; /* Signal retry needed */ + + /* Is this a PCIe capability (0x10)? */ + if ((cap & 0xff) == 0x10) { +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Found PCIe capability at offset 0x%x\n", + node, pcie_port, cap_next); +#endif + /* Offset 0xc contains the max link info */ + cap = cvmx_pcie_config_read32_retry(node, pcie_port, bus, 0, 0, + cap_next + 0xc); + if (cap == 0xffffffff) + return 1; /* Signal retry needed */ + dev_gen = cap & 0xf; /* Max speed of PEM from config (1-3) */ + dev_width = (cap >> 4) & 0x3f; /* Max lane width of PEM (1-16) */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Device supports %d lanes, speed gen%d\n", node, + pcie_port, dev_width, dev_gen); +#endif + break; + } + /* Move to next capability */ + cap_next = (cap >> 8) & 0xff; + } + + /* + * Desired link speed and width is either limited by the device or our + * PEM configuration. Choose the most restrictive limit + */ + desired_gen = (dev_gen < max_gen) ? dev_gen : max_gen; + desired_width = (dev_width < max_width) ? dev_width : max_width; + + /* + * We need a change if we don't match the desired speed or width. + * Note that we allow better than expected in case the device lied + * about its capabilities + */ + need_speed_change = (neg_gen < desired_gen); + need_lane_change = (neg_width < desired_width); + + if (need_lane_change) { + /* We didn't get the maximum number of lanes */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link width (%d) less that supported (%d)\n", + node, pcie_port, neg_width, desired_width); +#endif + return 2; /* Link wrong width, signal a retry */ + } else if (need_speed_change) { + if (do_retry_speed) { +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link speed (gen%d) less that supported (gen%d)\n", node, + pcie_port, neg_gen, desired_gen); +#endif + return 1; /* Link at width, but speed low. Request a retry */ + } + + /* We didn't get the maximum speed. Request a speed change */ +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link speed (gen%d) less that supported (gen%d), requesting a speed change\n", + node, pcie_port, neg_gen, desired_gen); +#endif + pciercx_cfg515.u32 = + CVMX_PCIE_CFGX_READ(pcie_port, + CVMX_PCIERCX_CFG515(pcie_port)); + pciercx_cfg515.s.dsc = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, + CVMX_PCIERCX_CFG515(pcie_port), + pciercx_cfg515.u32); + mdelay(100); + do_retry_speed = true; + goto retry_speed; + } else { +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link at best speed and width\n", + node, pcie_port); +#endif + /* For gen3 links check if we are getting errors over the link */ + if (neg_gen == 3) { + /* Read RC Correctable Error Status Register */ + pciercx_cfg068.u32 = + CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG068(pcie_port)); + if (pciercx_cfg068.s.res) { +#ifdef DEBUG_PCIE + printf("N%d.PCIe%d: Link reporting error status\n", node, + pcie_port); +#endif + return 1; /* Getting receiver errors, request a retry */ + } + } + return 0; /* Link at correct speed and width */ + } + + /* Update the Replay Time Limit. Empirically, some PCIe devices take a + * little longer to respond than expected under load. As a workaround + * for this we configure the Replay Time Limit to the value expected + * for a 512 byte MPS instead of our actual 256 byte MPS. The numbers + * below are directly from the PCIe spec table 3-4 + */ + pciercx_cfg448.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG448(pcie_port)); + switch (pciercx_cfg032.s.nlw) { + case 1: /* 1 lane */ + pciercx_cfg448.s.rtl = 1677; + break; + case 2: /* 2 lanes */ + pciercx_cfg448.s.rtl = 867; + break; + case 4: /* 4 lanes */ + pciercx_cfg448.s.rtl = 462; + break; + case 8: /* 8 lanes */ + pciercx_cfg448.s.rtl = 258; + break; + } + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG448(pcie_port), pciercx_cfg448.u32); + + return 0; +} + +static int __cvmx_pcie_rc_initialize_gen2_v3(int pcie_port) +{ + cvmx_rst_ctlx_t rst_ctl; + cvmx_rst_soft_prstx_t rst_soft_prst; + cvmx_pciercx_cfg031_t pciercx_cfg031; + cvmx_pciercx_cfg032_t pciercx_cfg032; + cvmx_pciercx_cfg038_t pciercx_cfg038; + cvmx_pciercx_cfg040_t pciercx_cfg040; + cvmx_pciercx_cfg515_t pciercx_cfg515; + cvmx_pciercx_cfg548_t pciercx_cfg548; + cvmx_pemx_bist_status_t pemx_bist_status; + u64 rst_soft_prst_reg; + int qlm; + int node = (pcie_port >> 4) & 0x3; + bool requires_pem_reset = 0; + enum cvmx_qlm_mode mode = CVMX_QLM_MODE_DISABLED; + int retry_count = 0; + int result = 0; + + pcie_port &= 0x3; + + /* Assume link down until proven up */ + pcie_link_initialized[node][pcie_port] = false; + + /* Attempt link initialization up to 3 times */ + while (retry_count <= MAX_RETRIES) { +#ifdef DEBUG_PCIE + if (retry_count) + printf("N%d:PCIE%d: Starting link retry %d\n", node, pcie_port, + retry_count); +#endif + if (pcie_port >= CVMX_PCIE_PORTS) { +#ifdef DEBUG_PCIE + printf("Invalid PCIe%d port\n", pcie_port); +#endif + return -1; + } + + qlm = __cvmx_pcie_get_qlm(node, pcie_port); + + if (qlm < 0) + return -1; + + mode = cvmx_qlm_get_mode(qlm); + if (__cvmx_pcie_check_pcie_port(node, pcie_port, mode)) + return -1; + + rst_soft_prst_reg = CVMX_RST_SOFT_PRSTX(pcie_port); + rst_ctl.u64 = CVMX_READ_CSR(CVMX_RST_CTLX(pcie_port)); + + if (OCTEON_IS_MODEL(OCTEON_CN78XX)) { + CVMX_WRITE_CSR(CVMX_DTX_PEMX_SELX(0, pcie_port), 0x17); + CVMX_WRITE_CSR(CVMX_DTX_PEMX_SELX(1, pcie_port), 0); + } + + if (!rst_ctl.s.host_mode) { + printf("N%d:PCIE: Port %d in endpoint mode.\n", + node, pcie_port); + return -1; + } + + /* Bring the PCIe out of reset */ + rst_soft_prst.u64 = CVMX_READ_CSR(rst_soft_prst_reg); + + /* + * After a chip reset the PCIe will also be in reset. If it + * isn't, most likely someone is trying to init it again + * without a proper PCIe reset. + */ + if (rst_soft_prst.s.soft_prst == 0) { + /* Disable the MAC controller before resetting */ + __cvmx_pcie_config_pemon(node, pcie_port, 0); + + /* Reset the port */ + rst_soft_prst.s.soft_prst = 1; + CVMX_WRITE_CSR(rst_soft_prst_reg, rst_soft_prst.u64); + + /* Read to make sure write happens */ + rst_soft_prst.u64 = CVMX_READ_CSR(rst_soft_prst_reg); + + /* Keep PERST asserted for 2 ms */ + udelay(2000); + + /* Reset GSER_PHY to put in a clean state */ + __cvmx_pcie_gser_phy_config(node, pcie_port, qlm); + requires_pem_reset = 1; + + /* Enable MAC controller before taking pcie out of reset */ + __cvmx_pcie_config_pemon(node, pcie_port, 1); + } + + /* Deassert PERST */ + rst_soft_prst.u64 = CVMX_READ_CSR(rst_soft_prst_reg); + rst_soft_prst.s.soft_prst = 0; + CVMX_WRITE_CSR(rst_soft_prst_reg, rst_soft_prst.u64); + rst_soft_prst.u64 = CVMX_READ_CSR(rst_soft_prst_reg); + + /* Check if PLLs are locked after GSER_PHY reset. */ + if (requires_pem_reset) { + cvmx_pemx_cfg_t pemx_cfg; + + pemx_cfg.u64 = csr_rd(CVMX_PEMX_CFG(pcie_port)); + if (CVMX_WAIT_FOR_FIELD64(CVMX_GSERX_QLM_STAT(qlm), cvmx_gserx_qlm_stat_t, + rst_rdy, ==, 1, 10000)) { + printf("QLM%d: Timeout waiting for GSERX_QLM_STAT[rst_rdy]\n", qlm); + return -1; + } + if (pemx_cfg.cn78xx.lanes8 && + (CVMX_WAIT_FOR_FIELD64(CVMX_GSERX_QLM_STAT(qlm + 1), + cvmx_gserx_qlm_stat_t, rst_rdy, ==, 1, 10000))) { + printf("QLM%d: Timeout waiting for GSERX_QLM_STAT[rst_rdy]\n", + qlm + 1); + return -1; + } + } + + /* Wait 1ms for PCIe reset to complete */ + udelay(1000); + + /* + * Check and make sure PCIe came out of reset. If it doesn't + * the board probably hasn't wired the clocks up and the + * interface should be skipped + */ + if (CVMX_WAIT_FOR_FIELD64_NODE(node, CVMX_RST_CTLX(pcie_port), + cvmx_rst_ctlx_t, + rst_done, ==, 1, 10000)) { + printf("N%d:PCIE: Port %d stuck in reset, skipping.\n", node, pcie_port); + return -1; + } + + /* Check BIST status */ + pemx_bist_status.u64 = CVMX_READ_CSR(CVMX_PEMX_BIST_STATUS(pcie_port)); + if (pemx_bist_status.u64) + printf("N%d:PCIE: BIST FAILED for port %d (0x%016llx)\n", node, pcie_port, + CAST64(pemx_bist_status.u64)); + + /* Initialize the config space CSRs */ +#ifdef DEBUG_PCIE + printf("N%d:PCIE%d Initialize Config Space\n", node, pcie_port); +#endif + __cvmx_pcie_rc_initialize_config_space(node, pcie_port); + + /* Enable gen2 speed selection */ + pciercx_cfg515.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG515(pcie_port)); + pciercx_cfg515.s.dsc = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG515(pcie_port), pciercx_cfg515.u32); + + /* Do the link retries on the PCIe interface */ + if (retry_count == MAX_RETRIES) { + /* + * This has to be done AFTER the QLM/PHY interface + * initialized + */ + pciercx_cfg031.u32 = + CVMX_PCIE_CFGX_READ(pcie_port, + CVMX_PCIERCX_CFG031(pcie_port)); + /* + * Drop speed to gen2 if link bouncing + * Result = -1 PEM in reset + * Result = 0: link speed and width ok no retry needed + * Result = 1: link errors or speed change needed + * Result = 2: lane width error + */ + if (pciercx_cfg031.s.mls == 3 && result != 2) { +#ifdef DEBUG_PCIE + printf("N%d:PCIE%d: Dropping speed to gen2\n", node, pcie_port); +#endif + pciercx_cfg031.s.mls = 2; + CVMX_PCIE_CFGX_WRITE(pcie_port, + CVMX_PCIERCX_CFG031(pcie_port), + pciercx_cfg031.u32); + + /* Set the target link speed */ + pciercx_cfg040.u32 = CVMX_PCIE_CFGX_READ( + pcie_port, CVMX_PCIERCX_CFG040(pcie_port)); + pciercx_cfg040.s.tls = 2; + CVMX_PCIE_CFGX_WRITE(pcie_port, + CVMX_PCIERCX_CFG040(pcie_port), + pciercx_cfg040.u32); + } + } + + /* Bring the link up */ + result = __cvmx_pcie_rc_initialize_link_gen2_v3(node, pcie_port); + if (result == 0) { +#ifdef DEBUG_PCIE + printf("N%d:PCIE%d: Link does not need a retry\n", node, pcie_port); +#endif + break; + } else if (result > 0) { + if (retry_count >= MAX_RETRIES) { + int link_up; +#ifdef DEBUG_PCIE + printf("N%d:PCIE%d: Link requested a retry, but hit the max retries\n", + node, pcie_port); +#endif + /* If the link is down, report failure */ + pciercx_cfg032.u32 = CVMX_PCIE_CFGX_READ( + pcie_port, + CVMX_PCIERCX_CFG032(pcie_port)); + link_up = (pciercx_cfg032.s.dlla && !pciercx_cfg032.s.lt); + if (!link_up) + result = -1; + } +#ifdef DEBUG_PCIE + else + printf("N%d.PCIE%d: Link requested a retry\n", node, pcie_port); +#endif + } + if (result < 0) { + int ltssm_state = __cvmx_pcie_rc_get_ltssm_state(node, pcie_port); + + printf("N%d:PCIE%d: Link timeout, probably the slot is empty (LTSSM %s)\n", + node, pcie_port, cvmx_pcie_get_ltssm_string(ltssm_state)); + return -1; + } + retry_count++; + } + + pciercx_cfg032.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG032(pcie_port)); + /* + * Errata PEM-28816: Link retrain initiated at GEN1 can cause PCIE + * link to hang. For Gen1 links we must disable equalization + */ + if (pciercx_cfg032.s.ls == 1) { +#ifdef DEBUG_PCIE + printf("N%d:PCIE%d: Disabling equalization for GEN1 Link\n", node, pcie_port); +#endif + pciercx_cfg548.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG548(pcie_port)); + pciercx_cfg548.s.ed = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG548(pcie_port), pciercx_cfg548.u32); + } + + /* Errata PCIE-29440: Atomic operations to work properly */ + pciercx_cfg038.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG038(pcie_port)); + pciercx_cfg038.s.atom_op_eb = 0; + pciercx_cfg038.s.atom_op = 1; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG038(pcie_port), pciercx_cfg038.u32); + + /* Errata PCIE-29566 PEM Link Hangs after going into L1 */ + pciercx_cfg548.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG548(pcie_port)); + pciercx_cfg548.s.grizdnc = 0; + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIERCX_CFG548(pcie_port), pciercx_cfg548.u32); + + if (result < 0) + return result; + + /* Display the link status */ + pciercx_cfg032.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIERCX_CFG032(pcie_port)); + printf("N%d:PCIe: Port %d link active, %d lanes, speed gen%d\n", node, pcie_port, + pciercx_cfg032.s.nlw, pciercx_cfg032.s.ls); + + pcie_link_initialized[node][pcie_port] = true; + return 0; +} + +/** + * Initialize a PCIe port for use in host(RC) mode. It doesn't enumerate the bus. + * + * @param pcie_port PCIe port to initialize for a node + * + * @return Zero on success + */ +int cvmx_pcie_rc_initialize(int pcie_port) +{ + int result; + + if (OCTEON_IS_OCTEON2() || OCTEON_IS_MODEL(OCTEON_CN70XX)) + result = __cvmx_pcie_rc_initialize_gen2(pcie_port); + else + result = __cvmx_pcie_rc_initialize_gen2_v3(pcie_port); + + if (result == 0) + cvmx_error_enable_group(CVMX_ERROR_GROUP_PCI, pcie_port); + return result; +} + +/** + * Shutdown a PCIe port and put it in reset + * + * @param pcie_port PCIe port to shutdown for a node + * + * @return Zero on success + */ +int cvmx_pcie_rc_shutdown(int pcie_port) +{ + u64 ciu_soft_prst_reg; + cvmx_ciu_soft_prst_t ciu_soft_prst; + int node; + + /* Shutdown only if PEM is in RC mode */ + if (!cvmx_pcie_is_host_mode(pcie_port)) + return -1; + + node = (pcie_port >> 4) & 0x3; + pcie_port &= 0x3; + cvmx_error_disable_group(CVMX_ERROR_GROUP_PCI, pcie_port); + /* Wait for all pending operations to complete */ + if (CVMX_WAIT_FOR_FIELD64_NODE(node, CVMX_PEMX_CPL_LUT_VALID(pcie_port), + cvmx_pemx_cpl_lut_valid_t, tag, ==, + 0, 2000)) + debug("PCIe: Port %d shutdown timeout\n", pcie_port); + + if (OCTEON_IS_OCTEON3()) { + ciu_soft_prst_reg = CVMX_RST_SOFT_PRSTX(pcie_port); + } else { + ciu_soft_prst_reg = (pcie_port) ? CVMX_CIU_SOFT_PRST1 : + CVMX_CIU_SOFT_PRST; + } + + /* Force reset */ + ciu_soft_prst.u64 = CVMX_READ_CSR(ciu_soft_prst_reg); + ciu_soft_prst.s.soft_prst = 1; + CVMX_WRITE_CSR(ciu_soft_prst_reg, ciu_soft_prst.u64); + + return 0; +} + +/** + * @INTERNAL + * Build a PCIe config space request address for a device + * + * @param node node + * @param port PCIe port (relative to the node) to access + * @param bus Sub bus + * @param dev Device ID + * @param fn Device sub function + * @param reg Register to access + * + * @return 64bit Octeon IO address + */ +static uint64_t __cvmx_pcie_build_config_addr(int node, int port, int bus, int dev, int fn, int reg) +{ + cvmx_pcie_address_t pcie_addr; + cvmx_pciercx_cfg006_t pciercx_cfg006; + + pciercx_cfg006.u32 = cvmx_pcie_cfgx_read_node(node, port, + CVMX_PCIERCX_CFG006(port)); + if (bus <= pciercx_cfg006.s.pbnum && dev != 0) + return 0; + + pcie_addr.u64 = 0; + pcie_addr.config.upper = 2; + pcie_addr.config.io = 1; + pcie_addr.config.did = 3; + pcie_addr.config.subdid = 1; + pcie_addr.config.node = node; + pcie_addr.config.es = _CVMX_PCIE_ES; + pcie_addr.config.port = port; + /* Always use config type 0 */ + if (pciercx_cfg006.s.pbnum == 0) + pcie_addr.config.ty = (bus > pciercx_cfg006.s.pbnum + 1); + else + pcie_addr.config.ty = (bus > pciercx_cfg006.s.pbnum); + pcie_addr.config.bus = bus; + pcie_addr.config.dev = dev; + pcie_addr.config.func = fn; + pcie_addr.config.reg = reg; + return pcie_addr.u64; +} + +/** + * Read 8bits from a Device's config space + * + * @param pcie_port PCIe port the device is on + * @param bus Sub bus + * @param dev Device ID + * @param fn Device sub function + * @param reg Register to access + * + * @return Result of the read + */ +uint8_t cvmx_pcie_config_read8(int pcie_port, int bus, int dev, int fn, int reg) +{ + u64 address; + int node = (pcie_port >> 4) & 0x3; + + pcie_port &= 0x3; + address = __cvmx_pcie_build_config_addr(node, pcie_port, bus, dev, fn, reg); + if (address) + return cvmx_read64_uint8(address); + else + return 0xff; +} + +/** + * Read 16bits from a Device's config space + * + * @param pcie_port PCIe port the device is on + * @param bus Sub bus + * @param dev Device ID + * @param fn Device sub function + * @param reg Register to access + * + * @return Result of the read + */ +uint16_t cvmx_pcie_config_read16(int pcie_port, int bus, int dev, int fn, int reg) +{ + u64 address; + int node = (pcie_port >> 4) & 0x3; + + pcie_port &= 0x3; + address = __cvmx_pcie_build_config_addr(node, pcie_port, bus, dev, fn, reg); + if (address) + return le16_to_cpu(cvmx_read64_uint16(address)); + else + return 0xffff; +} + +static uint32_t __cvmx_pcie_config_read32(int node, int pcie_port, int bus, int dev, int func, + int reg, int lst) +{ + u64 address; + + address = __cvmx_pcie_build_config_addr(node, pcie_port, bus, dev, func, reg); + if (lst) { + if (address && pcie_link_initialized[node][pcie_port]) + return le32_to_cpu(cvmx_read64_uint32(address)); + else + return 0xffffffff; + } else if (address) { + return le32_to_cpu(cvmx_read64_uint32(address)); + } else { + return 0xffffffff; + } +} + +/** + * Read 32bits from a Device's config space + * + * @param pcie_port PCIe port the device is on + * @param bus Sub bus + * @param dev Device ID + * @param fn Device sub function + * @param reg Register to access + * + * @return Result of the read + */ +uint32_t cvmx_pcie_config_read32(int pcie_port, int bus, int dev, int fn, int reg) +{ + int node = (pcie_port >> 4) & 0x3; + + pcie_port &= 0x3; + return __cvmx_pcie_config_read32(node, pcie_port, bus, dev, fn, reg, + pcie_link_initialized[node][pcie_port]); +} + +/** + * Write 8bits to a Device's config space + * + * @param pcie_port PCIe port the device is on + * @param bus Sub bus + * @param dev Device ID + * @param fn Device sub function + * @param reg Register to access + * @param val Value to write + */ +void cvmx_pcie_config_write8(int pcie_port, int bus, int dev, int fn, int reg, uint8_t val) +{ + u64 address; + int node = (pcie_port >> 4) & 0x3; + + pcie_port &= 0x3; + address = __cvmx_pcie_build_config_addr(node, pcie_port, bus, dev, fn, reg); + if (address) + cvmx_write64_uint8(address, val); +} + +/** + * Write 16bits to a Device's config space + * + * @param pcie_port PCIe port the device is on + * @param bus Sub bus + * @param dev Device ID + * @param fn Device sub function + * @param reg Register to access + * @param val Value to write + */ +void cvmx_pcie_config_write16(int pcie_port, int bus, int dev, int fn, int reg, uint16_t val) +{ + u64 address; + int node = (pcie_port >> 4) & 0x3; + + pcie_port &= 0x3; + address = __cvmx_pcie_build_config_addr(node, pcie_port, bus, dev, fn, reg); + if (address) + cvmx_write64_uint16(address, cpu_to_le16(val)); +} + +/** + * Write 32bits to a Device's config space + * + * @param pcie_port PCIe port the device is on + * @param bus Sub bus + * @param dev Device ID + * @param fn Device sub function + * @param reg Register to access + * @param val Value to write + */ +void cvmx_pcie_config_write32(int pcie_port, int bus, int dev, int fn, int reg, uint32_t val) +{ + u64 address; + int node = (pcie_port >> 4) & 0x3; + + pcie_port &= 0x3; + address = __cvmx_pcie_build_config_addr(node, pcie_port, bus, dev, fn, reg); + if (address) + cvmx_write64_uint32(address, cpu_to_le32(val)); +} + +/** + * Read a PCIe config space register indirectly. This is used for + * registers of the form PCIEEP_CFG??? and PCIERC?_CFG???. + * + * @param pcie_port PCIe port to read from + * @param cfg_offset Address to read + * + * @return Value read + */ +uint32_t cvmx_pcie_cfgx_read(int pcie_port, uint32_t cfg_offset) +{ + return cvmx_pcie_cfgx_read_node(0, pcie_port, cfg_offset); +} + +uint32_t cvmx_pcie_cfgx_read_node(int node, int pcie_port, uint32_t cfg_offset) +{ + cvmx_pemx_cfg_rd_t pemx_cfg_rd; + + pemx_cfg_rd.u64 = 0; + pemx_cfg_rd.s.addr = cfg_offset; + CVMX_WRITE_CSR(CVMX_PEMX_CFG_RD(pcie_port), pemx_cfg_rd.u64); + pemx_cfg_rd.u64 = CVMX_READ_CSR(CVMX_PEMX_CFG_RD(pcie_port)); + + return pemx_cfg_rd.s.data; +} + +/** + * Write a PCIe config space register indirectly. This is used for + * registers of the form PCIEEP_CFG??? and PCIERC?_CFG???. + * + * @param pcie_port PCIe port to write to + * @param cfg_offset Address to write + * @param val Value to write + */ +void cvmx_pcie_cfgx_write(int pcie_port, uint32_t cfg_offset, uint32_t val) +{ + cvmx_pcie_cfgx_write_node(0, pcie_port, cfg_offset, val); +} + +void cvmx_pcie_cfgx_write_node(int node, int pcie_port, uint32_t cfg_offset, uint32_t val) +{ + cvmx_pemx_cfg_wr_t pemx_cfg_wr; + + pemx_cfg_wr.u64 = 0; + pemx_cfg_wr.s.addr = cfg_offset; + pemx_cfg_wr.s.data = val; + CVMX_WRITE_CSR(CVMX_PEMX_CFG_WR(pcie_port), pemx_cfg_wr.u64); +} + +extern int cvmx_pcie_is_host_mode(int pcie_port); + +/** + * Initialize a PCIe port for use in target(EP) mode. + * + * @param pcie_port PCIe port to initialize for a node + * + * @return Zero on success + */ +int cvmx_pcie_ep_initialize(int pcie_port) +{ + int node = (pcie_port >> 4) & 0x3; + + if (cvmx_pcie_is_host_mode(pcie_port)) + return -1; + + pcie_port &= 0x3; + + /* CN63XX Pass 1.0 errata G-14395 requires the QLM De-emphasis be + * programmed + */ + if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_0)) { + if (pcie_port) { + cvmx_ciu_qlm1_t ciu_qlm; + + ciu_qlm.u64 = csr_rd(CVMX_CIU_QLM1); + ciu_qlm.s.txbypass = 1; + ciu_qlm.s.txdeemph = 5; + ciu_qlm.s.txmargin = 0x17; + csr_wr(CVMX_CIU_QLM1, ciu_qlm.u64); + } else { + cvmx_ciu_qlm0_t ciu_qlm; + + ciu_qlm.u64 = csr_rd(CVMX_CIU_QLM0); + ciu_qlm.s.txbypass = 1; + ciu_qlm.s.txdeemph = 5; + ciu_qlm.s.txmargin = 0x17; + csr_wr(CVMX_CIU_QLM0, ciu_qlm.u64); + } + } + + /* Enable bus master and memory */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIEEPX_CFG001(pcie_port), 0x6); + + /* Max Payload Size (PCIE*_CFG030[MPS]) */ + /* Max Read Request Size (PCIE*_CFG030[MRRS]) */ + /* Relaxed-order, no-snoop enables (PCIE*_CFG030[RO_EN,NS_EN] */ + /* Error Message Enables (PCIE*_CFG030[CE_EN,NFE_EN,FE_EN,UR_EN]) */ + { + cvmx_pcieepx_cfg030_t pcieepx_cfg030; + + pcieepx_cfg030.u32 = CVMX_PCIE_CFGX_READ(pcie_port, CVMX_PCIEEPX_CFG030(pcie_port)); + pcieepx_cfg030.s.mps = MPS_CN6XXX; + pcieepx_cfg030.s.mrrs = MRRS_CN6XXX; + pcieepx_cfg030.s.ro_en = 1; /* Enable relaxed ordering. */ + pcieepx_cfg030.s.ns_en = 1; /* Enable no snoop. */ + pcieepx_cfg030.s.ce_en = 1; /* Correctable error reporting enable. */ + pcieepx_cfg030.s.nfe_en = 1; /* Non-fatal error reporting enable. */ + pcieepx_cfg030.s.fe_en = 1; /* Fatal error reporting enable. */ + pcieepx_cfg030.s.ur_en = 1; /* Unsupported request reporting enable. */ + CVMX_PCIE_CFGX_WRITE(pcie_port, CVMX_PCIEEPX_CFG030(pcie_port), pcieepx_cfg030.u32); + } + + /* Max Payload Size (DPI_SLI_PRTX_CFG[MPS]) must match + * PCIE*_CFG030[MPS] + */ + /* Max Read Request Size (DPI_SLI_PRTX_CFG[MRRS]) must not + * exceed PCIE*_CFG030[MRRS] + */ + cvmx_dpi_sli_prtx_cfg_t prt_cfg; + cvmx_sli_s2m_portx_ctl_t sli_s2m_portx_ctl; + + prt_cfg.u64 = CVMX_READ_CSR(CVMX_DPI_SLI_PRTX_CFG(pcie_port)); + prt_cfg.s.mps = MPS_CN6XXX; + prt_cfg.s.mrrs = MRRS_CN6XXX; + /* Max outstanding load request. */ + prt_cfg.s.molr = 32; + CVMX_WRITE_CSR(CVMX_DPI_SLI_PRTX_CFG(pcie_port), prt_cfg.u64); + + sli_s2m_portx_ctl.u64 = CVMX_READ_CSR(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port)); + if (!(OCTEON_IS_MODEL(OCTEON_CN78XX) || OCTEON_IS_MODEL(OCTEON_CN73XX) || + OCTEON_IS_MODEL(OCTEON_CNF75XX))) + sli_s2m_portx_ctl.cn61xx.mrrs = MRRS_CN6XXX; + CVMX_WRITE_CSR(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port), sli_s2m_portx_ctl.u64); + + /* Setup Mem access SubDID 12 to access Host memory */ + cvmx_sli_mem_access_subidx_t mem_access_subid; + + mem_access_subid.u64 = 0; + mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */ + mem_access_subid.s.nmerge = 0; /* Merging is allowed in this window. */ + mem_access_subid.s.esr = 0; /* Endian-swap for Reads. */ + mem_access_subid.s.esw = 0; /* Endian-swap for Writes. */ + mem_access_subid.s.wtype = 0; /* "No snoop" and "Relaxed ordering" are not set */ + mem_access_subid.s.rtype = 0; /* "No snoop" and "Relaxed ordering" are not set */ + /* PCIe Address Bits <63:34>. */ + if (OCTEON_IS_MODEL(OCTEON_CN68XX)) + mem_access_subid.cn68xx.ba = 0; + else + mem_access_subid.cn63xx.ba = 0; + CVMX_WRITE_CSR(CVMX_PEXP_SLI_MEM_ACCESS_SUBIDX(12 + pcie_port * 4), mem_access_subid.u64); + + return 0; +} + +/** + * Wait for posted PCIe read/writes to reach the other side of + * the internal PCIe switch. This will insure that core + * read/writes are posted before anything after this function + * is called. This may be necessary when writing to memory that + * will later be read using the DMA/PKT engines. + * + * @param pcie_port PCIe port to wait for + */ +void cvmx_pcie_wait_for_pending(int pcie_port) +{ + cvmx_sli_data_out_cnt_t sli_data_out_cnt; + int a; + int b; + int c; + + sli_data_out_cnt.u64 = csr_rd(CVMX_PEXP_SLI_DATA_OUT_CNT); + if (pcie_port) { + if (!sli_data_out_cnt.s.p1_fcnt) + return; + a = sli_data_out_cnt.s.p1_ucnt; + b = (a + sli_data_out_cnt.s.p1_fcnt - 1) & 0xffff; + } else { + if (!sli_data_out_cnt.s.p0_fcnt) + return; + a = sli_data_out_cnt.s.p0_ucnt; + b = (a + sli_data_out_cnt.s.p0_fcnt - 1) & 0xffff; + } + + while (1) { + sli_data_out_cnt.u64 = csr_rd(CVMX_PEXP_SLI_DATA_OUT_CNT); + c = (pcie_port) ? sli_data_out_cnt.s.p1_ucnt : + sli_data_out_cnt.s.p0_ucnt; + if (a <= b) { + if (c < a || c > b) + return; + } else { + if (c > b && c < a) + return; + } + } +} + +/** + * Returns if a PCIe port is in host or target mode. + * + * @param pcie_port PCIe port number (PEM number) + * + * @return 0 if PCIe port is in target mode, !0 if in host mode. + */ +int cvmx_pcie_is_host_mode(int pcie_port) +{ + int node = (pcie_port >> 4) & 0x3; + cvmx_mio_rst_ctlx_t mio_rst_ctl; + + pcie_port &= 0x3; + if (OCTEON_IS_MODEL(OCTEON_CN78XX) || OCTEON_IS_MODEL(OCTEON_CN73XX)) { + cvmx_pemx_strap_t strap; + + strap.u64 = CVMX_READ_CSR(CVMX_PEMX_STRAP(pcie_port)); + return (strap.cn78xx.pimode == 3); + } else if (OCTEON_IS_MODEL(OCTEON_CN70XX)) { + cvmx_rst_ctlx_t rst_ctl; + + rst_ctl.u64 = csr_rd(CVMX_RST_CTLX(pcie_port)); + return !!rst_ctl.s.host_mode; + } + + mio_rst_ctl.u64 = csr_rd(CVMX_MIO_RST_CTLX(pcie_port)); + if (OCTEON_IS_MODEL(OCTEON_CN61XX) || OCTEON_IS_MODEL(OCTEON_CNF71XX)) + return mio_rst_ctl.s.prtmode != 0; + else + return !!mio_rst_ctl.s.host_mode; +} |